Dustin,
If you plan on soloing on May 1st, your 16th birthday, you're going to need a 3rd class medical, or higher. I recieved my 3rd class when I was 15 so I could solo on my 16th in July. My birthday happened to be on a Sunday and the AME wasn't open so I got it a few weeks in advance so I could get my student pilot certificate.
If I were you, I would just get it now and get it over with ;